Dental chair



(No Model.) 5 Sheets-fleet l.

r A. P. GOULD.

DENTAL CHAIR.

No. 581,986. Patented May 4, 1897.

WIT/M58826" Z Ill 7E 102 (No Model) 5 SheetsSheet 2.

A. P. GOULD.

DENTAL CHAIR.

No. 581,986. Patented May 4, 1897.

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(No Model.)

- 5 Sheets-Sheet 4. A. P. GOULD.

DENTAL CHAIR.

No. 581,986. Patented May 4, 1897.

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A. P. GOULD. DENTAL CHAIR.

No. 581,986. Patented May 4,1897.

.diiorney AARON P. GOULD, OF CANTON, OHIO.

DENTAL CHAIR.

SPECIFICATION forming part of Letters Patent No. 581 ,986, dated May 4, 1897. Application filed September 16,1896. Serial No. 606,061. (No model.)

To aZZ whom it may concern.-

Be it known that I, AARON P. GOULD, a citizen of the United States, and a resident of Canton, county of Stark, State of Ohio, have invented a new and useful Improvement in Dental Chairs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

My invention relates to improvements in dental chairs 5 and it consists of certain features of construction and combination of parts, as will be hereinafter described and claimed.

Figure l of the accompanying drawings is a View in perspective from right rear illustratingmyinvention. Fi 2 isa similar view showing a fragment of the seat-frame and upholstered frame and a check or stop to regulate the horizontal movement of the seat one way. Fig. 3 is a similar view of a holdingframe and rack by which the upholstered back may be adjusted forward or back, as desired. Fig. 4 is a vertical section through the center of the chair. Fig. 5 is a similar view through the base of the chair, a distance to the right of that shown in Fig. 4, through the pump. Fig. 6 is a perspective right front View. Fig. 7 is a vertical section of the arm and seat-frame and arm-retaining clamp. Fig. 8 is a side view of frame-piece of a childs foot-rest. Fig. 9 is a side view of oiltank, with a portion cut away to show the chair-supporting cylinder and the pump-cylinder. Fig: 10 is a plan view of the oil-tank with the lid off, showing the contents. Fig. 11 is a vertical section on w mof Fig. 10. Fig. 12 is a similar section on line 3 4 of Fig. 10. Fig. 13 is a similar section on line 2; a, Fig. 10. Fig. 14 is a similar section on line 0; 12, Fig. 10. Fig. 15 is a similar section on line m m, Fig. 10. Fig. 16 is a perspective from rear right of a fragment of the chair-back, showing the head-rest support and head-rest in normal position. Fig. 17 is a View in elevation of the left side of the head-rest support, partly sectional, looking in the direction of the arrow, Fig. 16, and showing the cushion-support turned at a right angle to the position it occupies in Fig. 16. Fig. 18 is a perspective of the clamp. by which the head-rest is secured in desired adjustment.

Fig. 18 is a horizontal sectional view of said clamp. Fig. 19 is a perspective view of clamping-screw. Fig. 20 is a transverse section on Z Z, Fig. 17. Fig. 21 is a perspective of the circular chair-body support. Fig. 22 is a plan View showing the circular rotatable support for the chair-body. Fig. 23 is a fragment of hoisting-piston, showing piston and returntubes.

A denotes a stationary base having at its top portion an upwardly-projected annular flange a and an annular shoulder b, on which is placed a rotatable section 13, having upwardly and rearwardly projected arms O, to which is pivotally secured an arm, as D, to the forward end of which is pivotally secured a rearwardly-projecting arm E. The section B is adapted to turn on the base A and be looked thereto by a set-screw h At the upper end of arm E is pivotally secured a seat-support F by the transverse pivot c, by which the support F may be tipped or rocked with respect to the arm E and swung longitudinally with said arm. In the upper face of the circular track portion of the seatsupport F is provided an annular groove d, in which is placed a corresponding rib e on the under face of the seat-frame G. The two circular frames F and G are pivotally secured togetherby the vertical bolt f, passed through the cross-bars g.

On the front side of frame F is pivotally secured a springpawl 72., adapted to engage a rack j, which may be released by a downward pressure on the rearwardly-projected arms or pedals 7c, the front-ends of which are integral with the said pawl, the object of which is to provide means for securing the body of the chair in desired tilted adjustment.

On the circular portion G of the seat-frame are provided lugs l, to which the sides H of the chair-body are secured by the bolts m. (See Fig. 22.) On the top front of part G is journaled a rook-shaft J, having downwardlyprojected arms at, to which are pivotally secured lugs o, projected down from the front side of the seat-cushion support K. The arms n are provided at each end of the rock-shaft J and lugs 0 on each side of the cushion-support K. By pivoting the lugs to the armsn, as shown in Fig. 2, a swinging connection is effected between the cushion-support K and the frame G, at the front end thereof. The back-rest frame L is pivotally secured to the rear end portion of the side frame 11 by pivot to and is provided with a central and downwardly and forwardly projected arm 19, that is pivotally connected to lugs q, projected rearwardly from the cushion-support K. It will be seen that by a forward-and-back movement of the top of the back-frame the seat-. cushion frame K will have a reverse movementthat is, when the chair-back is moved backward the seat will be moved forward, and when the back is moved forward the seat will be moved backward.

At the right-hand side of the chair-bodyis provided a check-bar 9, that is passed through a loop 8, secured to inner side of one of the arms of the frame H and pivotally secured to the lug O and arm n, as shown in Fig. 2. A thumb-screw t passes through the loop 5 and engages the bar 4", whereby the back and seat may be secured in desired adjustment.

The back-frame L has secured thereto in a sliding relation an extension-frame M, hav ing hinged to its upper end a cushion-board N. On the front side of the frame M is provided a transverse rib o and to the cushionboard N is pivoted a gravity-pawl to, having teeth on its lower side to engage the rib t to hold the cushion at desirable adjustment, whereby the cushion may be thrown out or forward at its lower end to support the back of the patient. The pawl is provided with a handle W to throw the pawl out of engagement with the rib Q) to allow the cushionboard to fall back against the frame M.

To the arm D and about central thereto is pivoted a sway-bar 0, having at its upper end a link or, that is pivoted to the arm E. The lower end of the bar 0 is bifurcated to form prongs g, which are connected to upper portion B of the base by the links 2.

To raise the arm D, and thereby the arm E and chair-body, I provide an oil-well P, (see Figs. 4, 9, and 10,) in which is placed a pump Q and a lifting-cylinder It. In the latter is provided a suitable piston-head ct, the upper portion of which is cupped or cylindrical, having pivotally secured therein a connecting-rod, as a the upper end of which has a pivotal connection with the under side of arm E.

To the same base S that supports the cylinder R is secured the pump-cylinder Q. In the cylinder Q is a hollow plunger b, having pivotally secured at its inside lower portion a connecting-rod b the upper end of which is connected with a foot-lever U, the front end of which is pivotally secured to lugs 11 on the top of base-piece B, as shown in Fig. 5. Below the plunger 12 is placed a coiled spring (1 by which the free end of the lever and the plunger are raised when the footpressure is released.

In the base S are provided sockets z 2 .2 In the bottom of each is provided a valve seat b and in the sockets .2 z are provided valves 1), and at the upper end of said sockets z 2 are provided closing screw-caps b In operation as the piston Z2 is raised oil will flow from the well through the screencovered take-in conduit (Z to socket z, thence through conduit d to the pump-cylinder. On the descent of the plunger the oil will be forced from the pump via conduit (1 the socket 2 and conduit 61 to the hoisting-cylinder, by which the piston-head a is raised. In other words, by each elevation of the plunger 1) by the spring (Z a quantity of fluid will be drawn from the well P into the pumpcylinder, and at each descent of the plunger the fluid will be driven through the beforement-ioned conduits d (1 into the hoistingcylinder, by which whereby the piston a will be raised to raise the arms D and E and the chair-body, and the valves Z) will prevent the return flow of the oil, thereby holding the chair-body at a desired elevation. To lower the chair-body, (see Fig. 11,) the socket e is provided, which communicates with the hoisting-cylinder B through a conduit (1 In the socket e is provided a valve d covering an exit-conduit c1 which leads out into the well P.

Over the valve d is placed a plunger and spring h to reseat the valve, and a retaining screw-cap 71 To lift the valve d" to allow the outflow of the fluid, a tripis provided consisting of a pin 703 of less diameter than the conduit (Z and placed therein, one end resting under the valve, the other on a toe extension of a link h the upper end of which has a crank connection with a rock-shaft its, having on its outer end a pedal-lever It. By placing the foot on the pedal-lever h the shaft It will be rocked to lift the valve (Z to allow the fluid to flow from the cylinder R to the well P.

To provide against overflowing of oil that may have leaked past the packing a an annular groove a is provided in the piston a, as shown in Fig. 23, into which the oil gathers and flows about the piston to one or more of the apertures 77. through which it will pass into the grooves or channels a, formed in a band a, that encircles the upper end of the cylinder R, and thence down into the well. There is also provided an aperture h leading from the groove a to the inside or cup portion of the piston, into which the leakage may flow and remain when the chair is used on low grades, so that when the chair is raised to a point where the groove 0. of the piston registers with the aperture ha of the cylinder the oil may escape from the cup portion of the piston through the groove at back into the well. To the seat-frame H, or that portion extending down to form a leg-rest, is hinged a detachable foot-rest A, having side pieces h formed substantially as shown in Fig. 8, one end of which is adapted to hook over studs a projecting from the frame H.

To the side frame H is detachably secured the arm-rest A having a lug h that caps over the top of side 11, and at the lower end portion a locking mechanism, which in this instance consists of a pivoted snap-hook 7L9, the bill of which passes through an aperture h in the side H and engages the inner face thereof. To remove the arm A the handle 71. of the hook 71 is pressed inwardly, which movement will release the hook it from frame II to allow of the removal of the arm-rest A My improved head-rest consists of the support secured to the chair-back, said sup port having at its upper end a circular por- }ti on k having on one face a series of cogs cured a tubular portion it, formed of two parts 70 and 76 that inclose a shaft 70 on one end of which is mounted a pinion k that engages the teeth on the circle 7& On the outer screw-threaded end of the shaft 70 is placed a cupped nut 7t,that embraces the ends of the parts it and 70 holding them in tubular form on the shaft. This tube and shaft are passed through an elongated apcrture 710 in a coupling-link 70 On the opposite side of the tube It is provided a washer 10 that has been passed over the end of the coupling-link 16 A tube m, similar to k embraces a shaft m having mounted on one end a pinion m 011 one end of the parts that form the tube m are provided prongs 'm, that embrace the circular portion m projected from the cushion-support m On one face of the circular portion m are provided teeth m that engage similar teeth on the pinion m A cupped nut in is provided at the lower end of the two-part tube m and has the same function as the cap it. To secure the parts in desired adjustment, a handscrew m is turned into a threaded aperture m in the end of the link 7t".

In operation, to adjust the cushion or headrest the screw m is turned back to lessen the pressure of the tubes on the shafts to allow the cushion to be raised or lowered or rocked on its pivotal connection with the tube m, the teeth m on the circle m engaging the teeth of pinion m On the shaft m will rotate the released tube m, and the cushion may be carried or rocked over the back of the chair by moving the shaft k about its pivotal connection with the support 70, the teeth of pinion k engaging the teeth k on the circle k and by turning in the screw m the inner end will engage the tube 7.3 and force itlengthwise the longitudinal aperture 15 against the washer 70 which will be forced against the tube m, thus locking the parts in desired adjustments.

Having thus fully described my invention, what I claim is- 1. In a dental chair, the combination with the chair base and chair-body, and means for connecting the same, of lifting mechanism consisting of a pump which communicates with the well, a chamber within the well having a valve-controlled communication with the pump, a band surrounding the upper poi" To said circular portion is pivotally setion of said chamber, leaving an intervening space which communicates with the chamber through a hole in its side near its upper end, a hollow piston within the chamber, provided with an annular groove intersected by an aperture which communicates with the hollow of the piston and means for connecting the piston with the chair-body.

2. In a dental chair, the combination with the seat-support, and a seat-frame pivoted to turn on said support, a cushion-frame having lugs projecting downward from its forward under portion, a shaft journaled upon the forward portion of the seat-frame, and provided with arms or cranks which are pivoted to said lugs, whereby a swinging movement is effected between the seat-frame and cushion-frame.

3. In a dental chair, the combination with the seat-support, the seat-frame pivoted to turn tl1ereon,'sides secured to the seat-frame and provided with upwardly-extended rear ends, a cushion-frame having at its forward end downward-extending lugs, a shaft journaled on the forward portion of the seat-frame and provided with arms which are pivoted to said lugs, a back-frame having an extension pivoted to the rear end of the cushion-frame, and extensions pivoted to the rear ends of the sides.

4. In a dental chair, the combination with the seat-support, a seat-frame mounted thereon, a cushion-frame arranged above the lat ter, sides secured to the seat-support, a crossshaft j ournaled at the forward portion of the seat-frame and provided with arms that are pivoted to lugs depending from the cushionframe, a check-bar pivoted to one of said lugs, and one of said arms, and passing through a sleeve secured to the inner face of one of the sides, and a set-screw passed through said side and the sleeve and engaging said bar.

5. In a dental chair, the combination with the sides thereof,havin g apertures, of the armrests having lugs or hooks on their inner sides intermediate their ends for embracing the upper edges of the sides, and hooks pivoted to their lower ends to project through the apertures in the sides and engage the inner faces of the sides.

6. In a dental chair, the combination with the sides thereof, having apertures,of the armrests having lugs or hooks on the inner sides intermediate their ends for embracing the upper edges of the sides, and spring-actuated hooks pivoted to their lower ends to project through the apertures in the sides and engage the inner faces of the sides.

7. In a dental chair, the combination with the foot-rest 'section, the inner faces of the side, pieces of which are provided with studs, of a supplemental or childs foot-rest section having hooked rear ends adapted to engage the studs so that it maybe tilted into and out of use or be removed.

8. In a head-rest for dental chairs, the combination with the head-rest support, adapted 9. In a head-rest for dental chairs, the com-- binatiouwith the head-rest support adapted to be secured to the chair, and provided with segmentally-arranged teeth, a two-part tube pivoted to said support, a shaft embraced by said tube, and provided at one end with a pinion to engage the teeth of said support, a head-cushion frame, connections between the cushion-frame and the tube, means for clamping the tube to the shaft, and a cap for embracing the free endof the tube, to hold it in tubular form and prevent the separation of its parts when the clamping means are released or loosened. I

10. In ahead-rest for dental chairs,the combination with the head-rest support, adapted to'be secured tothe chair, of a head-cushion frame having a plate provided with segmentally-arranged teeth, a two-part sleeve pivoted to said plate, a shaft within said tube provided with a pinion to engage said teeth,

.back of the chair and provided with a segmental row of teeth, two tubes, each consisting oftwo parts, a head-cushion frame hav- Iing a plate provided with a segmental row of teeth, one of said tubesbeing pivoted to said plate, and the other to saidsupport, a shaft in each tube, a pinion on each shaft, onepinion engaging the teeth of the support, and the other pinion engaging the teeth of the Zhead-cushion frame, a tubular link provided with two apertures, one'of which is elongated, said tubes being inserted through said apergtures, a washer on said link interposed beitween said tubes, and a set-screw workingin the end of the link for clamping the tubes to their shafts.

. In testimony whereof I have hereunto set my hand this lith day of September,,A. D. 1896.

AARON P. GOULD.

Witnesses:

K. MILLER, CHAS. M. BALL. 

